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Because my iPad update to iOS 13 then my old app doesn't work correctly, but source code of my App is Swift 2.3 and my Mac also update to Mac OS Catalina, when I download Xcode 8.3 from Apple Developer web site and install it alert Xcode 8.3 is not from Apple so it can't open. So do you know why is it? It's from Apple but can't open??Does anybody have the same issue?
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